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Peter N.  Mantas

Peter N. Mantas

Partner Fasken
In an increasingly complex business world, the risk of running afoul of the law, both at home and abroad, cannot be underestimated.
Jurisdiction Ontario, 1994 | New York, 1993
Language(s) English, Greek, French
Office(s) Ottawa , Toronto

Peter Mantas is the head of the Ottawa litigation group and co-leader of the firm’s White Collar Defence and Investigations group. An experienced litigation lawyer, and member of the Bars of Ontario and New York, Peter Mantas has acted in some of the most prominent cases in the country.

In his litigation practice, Peter has particular expertise in proceedings involving government, public procurement, fraud, copyright, defamation, class actions, competition, trade and international investigations and proceedings. Frequently retained to represent high-profile clients, he is valued for his understanding of reputational risk, media relations and crisis management.

Peter has considerable experience in cases involving a large and complex documentary record. He is an avid user and proponent of technology in the litigation process in order to reduce costs and achieve better results.

Peter has experience advising clients in both civil and criminal cases. He has acted as counsel before numerous judicial bodies including the Supreme Court of Canada, the Canadian International Trade Tribunal, various provincial and territorial courts, and international and domestic arbitration panels.

Co-leader of Fasken’s white collar defense and investigations group and an editor of the blog, White Collar Post, clients appreciate Peter’s careful preparation, strategic advice and tough but reasonable approach.

Peter’s expertise has been recognized by Chambers Canada, Benchmark Litigation, the Legal 500 Canada and Lexpert. He has been nominated in Canadian Lawyer magazine as one of the 25 most influential lawyers in Canada.


  • LLB University of Ottawa
  • BA, Trinity College University of Toronto

Community involvement

Memberships & Affiliations

  • Member of the Executive 2012-17 (Co-Chair, 2015-16) Class Actions Section, Ontario Bar Association
  • Member, Canadian Bar Association
  • Member, American Bar Association
  • Member, Country of Carleton Law Association
Article Commentary: Anti-corruption rules watered down for US miners The Northern Miner
Article President Trump and Congress Water Down Anti-Corruption Rules for U.S. Mining Companies White Collar Post
Article CASL 2017: The Sleeping Giant Awakens Capital Perspectives
Presenter Canada's Anti-Spam Legislation-Private Right of Action & Other Developments location location Ottawa, ON
Litigating against the Government location location Ottawa Ottawa, ON
Key note Speaker When Contracts Come Under Fire: A Litigator’s Perspective location location Ottawa, ON


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